The refractive index of a material for infrar | vedclass

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Question

(B) According to Cauchy's dispersion formula,the refractive index $\mu$ of a material is related to the wavelength $\lambda$ by the relation $\mu \app

Vedclass · Accepted Answer

Less than that for ultraviolet light

Vedclass · Answer

(B) According to Cauchy's dispersion formula,the refractive index $\mu$ of a material is related to the wavelength $\lambda$ by the relation $\mu \approx A + \frac{B}{\lambda^2}$.This shows that the refractive index $\mu$ is inversely related to the wavelength $\lambda$.Since the wavelength of infrared light is greater than the wavelength of ultraviolet light $(\lambda_{	ext{infrared}} > \lambda_{	ext{ultraviolet}})$,the refractive index for infrared light will be less than the refractive index for ultraviolet light.Therefore,$\mu_{	ext{infrared}} < \mu_{	ext{ultraviolet}}$.

The refractive index of a material for infrared light is:

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